Clear and colorless three-dimensional articles made via stereolithography and method of making said articles
a three-dimensional article, clear and colorless technology, applied in the field of three-dimensional articles, can solve the problems of material having a deleterious effect on the physical properties of the cured three-dimensional article, undesired color development, and material development undesired
Inactive Publication Date: 2009-01-01
DSM IP ASSETS BV
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- Description
- Claims
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Benefits of technology
The invention is a method for creating a liquid radiation curable resin that can be used to create clear and colorless three-dimensional articles through a stereolithography process. The resin is made up of specific components that work together to create the desired properties in the final article. The resin has a high clarity and transmittance, with no color present. The invention also includes a color masking agent that helps achieve the clear and colorless appearance. The resulting article has good clarity and transmittance, with no color present.
Problems solved by technology
The color development can be undesired.
This occurs when a colorless shaped article is desired, but the standard liquid resin used to make the shaped article has components in it that develop undesired color under cure.
However, it has been found that these certain added materials have a deleterious effect upon the physical properties of the cured three dimensional articles.
Method used
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example 1
[0257]The following radiation curable liquid resin was made. The radiation curable liquid composition was prepared by weighing all the components into a container under mechanical stirring either at room temperature or up to 50° C. until a homogeneous resin mixture was obtained. The liquid mixture was then filtered off into a vat of stereolithography apparatus using a medium paint filter before fabrication of parts.
WeightChemical TypeComponent(%)Cycloaliphatic epoxyCelloxide 2021P44.5800Hydrogenated Bisphenol AEponex 151010.0000diglycidyletherOxetaneOXT-1018.0000Propoxylated TMPTASR49211.9995Bisphenol A diglycidyletherEbecryl 37006.0000diacrylatePolyether polyolPluracol GP43012.0000Free radical photoinitiatorIrgacure 1843.0000Cationic photoinitiatorChivacure 11764.0000Antioxidant, additiveIrganox 10350.2000Wetting agent, additiveSilwet L-76000.2000Air release agent, additiveBYK A5010.0200Blue pigment dispersionPhthalocyanine Blue0.0002Violet pigment dispersionCarbozole Violet0.0003T...
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Abstract
The invention is a radiation curable liquid resin that can be used to make a clear and colorless, three-dimensional article by a stereolithography process. The clear and colorless three-dimensional articles have a clarity and transmittance of greater than about 67% as measured by UV-Visible spectrophotometer in the 400-500 nm range; and a lack of color as measured by a b* value of between about minus 0.5 (−0.5) and about positive 2.5 (+2.5) in the CIELAB color space using a spectrophotometer in the visible wavelengths of 400-750 nm.
Description
FIELD OF THE INVENTION[0001]The present invention relates to three-dimensional articles made using a radiation curable resin and stereolithography equipment.BACKGROUND OF THE INVENTION[0002]The production of cured three-dimensional articles of complex shape by means of stereolithography has been known for a number of years. In this technique the desired shaped article is built up from a radiation-curable composition with the aid of a recurring, alternating sequence of two steps (a) and (b). In step (a), a layer of the radiation-curable composition, one boundary of which is the surface of the composition, is cured with the aid of appropriate imaging radiation, preferably imaging radiation from a computer-controlled scanning laser beam, within a surface region which corresponds to the desired cross-sectional area of the shaped article to be formed, and in step (b) the cured layer is covered with a new layer of the radiation-curable composition, and the sequence of steps (a) and (b) is...
Claims
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IPC IPC(8): G03C1/04G03C5/00
CPCG03F7/0037G03F7/038G03F7/027G03F7/004G03F7/0045G03F7/0382
Inventor SARMAH, SATYENDRA KUMARZARAS, KEVIN ANDREW
Owner DSM IP ASSETS BV